CVE-2024-53270Public exploitNetwork attack vector

Remote service crash via null request dereference

Published Dec 18, 2024 · Updated Dec 18, 2024

Denial of service in affected Envoy releases allows remote attackers to crash the proxy through crafted HTTP/1 traffic. ServerConnectionImpl::sendProtocolError calls onMessageBeginImpl for a missing active_request_, then dereferences it after the reset path returns success. Exploitation requires the http1_server_abort_dispatch load-shed point and a stream reset during dispatch; process termination interrupts proxy service.

CVSS severity7.5
High
EPSS probability0.70%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in affected Envoy releases allows remote attackers to crash the proxy through crafted HTTP/1 traffic. ServerConnectionImpl::sendProtocolError calls onMessageBeginImpl for a missing active_request_, then dereferences it after the reset path returns success. Exploitation requires the http1_server_abort_dispatch load-shed point and a stream reset during dispatch; process termination interrupts proxy service.

The record

CVE
CVE-2024-53270
Published
Dec 18, 2024
Updated
Dec 18, 2024
Vendor
Envoy Proxy
Product
Envoy
Classifications
CWE-670, CWE-476, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 18, 2024CVE publishedPublication date reported by the CVE source.
  2. Dec 18, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.29.12
  2. Affected versionversion=>= 1.30.0, < 1.30.9
  3. Affected versionversion=>= 1.31.0, < 1.31.5
  4. Affected versionversion=>= 1.32.0, < 1.32.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Envoy Proxy · Envoyversion=< 1.29.12; version=>= 1.30.0, < 1.30.9; version=>= 1.31.0, < 1.31.5; version=>= 1.32.0, < 1.32.3

Published CVSS scores

7.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-670Always-Incorrect Control Flow Implementation
CWE-476NULL Pointer Dereference
T1499Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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